Comment 5 for bug 1512912

Installed apps list is now sorted by installation date. Other apps lists such searches and list of apps for a category remain sorted alphabetically.

Changes in core:
 - Client now queries in an optimized way the list of PackageKit transactions meanwhile obtaining the packages list in order to find installed applications date. With this change we can know the installation date of each installed application, this information is added to the Pk.Package object. To achieve this a new class that inherits from Pk.Package and extends it functionality had to be created in the Core, due to PackageKit public library limitations.

Changes in views:
 - AppListView can now be sorted in two ways (alphabetically and by installation date). By default it is sorted alphabetically but in the installed applications view it is sorted by installation date.